CN105772518B - A kind of two sections of sparse section cooling methods of hot-rolling high-strength steel stress minimizing - Google Patents
A kind of two sections of sparse section cooling methods of hot-rolling high-strength steel stress minimizing Download PDFInfo
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Abstract
The present invention relates to a kind of sparse section cooling method of two sections of hot-rolling high-strength steel stress minimizing, it is characterised in that and methods described step is as follows,（1）Determine the intensity and product thickness of steel grade；（2）Determine the mode of two sections of sparse coolings；（3）The sparse cooling system of first paragraph sets and opened；（4）The setting and unlatching of the sparse cooling of second segment.This method can be eliminated using the bad plate shape such as wave and side wave in caused high-strength steel after traditional one-step cooling method, finish rolling high-strength steel i.e. caused by the type of cooling is unreasonable is in the middle part that the roller repairing stage occurs or edge shape wave, so as to significantly improve strip shape of hot-rolled high-strength steel, the quality of hot rolled plate high strength steel plate is improved, meets the needs of every profession and trade.
Description
Technical field
The present invention relates to a kind of cooling means, two sections of sparse laminar flows of more particularly to a kind of hot-rolling high-strength steel stress minimizing
Cooling means, belong to controlling hot rolling technical field.
Background technology
With the rapid development of steel and iron industry, the contradiction between steel and iron industry such as mineral resources, the energy, environment is increasingly convex
It is existing.Adjust the product mix, it is the effective ways for solving this contradiction to make ferrous materials high performance.High strength steel can be with relatively low
Cost obtain more preferable material property, be widely used in building, railway, bridge, oil-gas pipeline, ship, automobile, national defence at present
The fields such as military project.Numerous domestic iron and steel enterprise was sought to lift ratio of the high-strength steel in product mix as target in recent years
Bigger economic benefit and social benefit.
In recent years, increasing domestic advanced hot rolling producing line develops different groups by using cooling controlling and rolling controlling process (TMCP)
Knit the high-strength steel of performance.The technology generally uses the cooling velocity after rolling and coiling temperature of laminar cooling system control panel band, makes
Strip obtains good metallographic structure and mechanical property.Using laminar flow cooling technology to ensure to have preferable cooling uniformity, compared with
High control precision of coiling temperature and effective control to cooling velocity.But in actually cooling procedure is rolled, due to cooling
Speed and cooling uniformity etc. reason form thermal stress effect, easily cause the plate shape problem such as strip warpage, wave.In reality
In production, high-strength steel carries out the common edge of uncoiling at normal temperatures or middle part shape wave is present, and such plate shape problem turns into be used
The bottleneck of TMCP technological development high-strength steel.Because hot rolling instrument typically uses the principle of laser measurement, it is merely able to detect visible
Extra-stress inequality caused by after shape wave, the potential shape wave of think gauge and cooling can not be learnt, result between control and market
Disconnection, also hamper the improvement of site technology, therefore, exploitation one kind can be by controlling high-strength steel during roller repairing
The laminar flow cooling technology of stress variation trend be particularly important, this has for improving product quality and improving lumber recovery
Positive meaning.
The roller repairing of high-strength steel is extremely complex process, and this process is except complicated heat exchanging process being present, therebetween
Further relate to phase transformation and the Volume Changes of steel.In cooling procedure, along high-strength steel width and the inhomogeneous cooling of thickness direction
Thermal stress will be produced, simultaneously as phase transition process be present, latent heat of phase change can be produced, due to each several part phase transformation inside high-strength steel
Time and phase-change organization are inconsistent, and the phase change expansion of each several part also differs, thus can produce structural stress.Thermal stress and tissue
Stress makes high-strength steel be possible to produce plastic deformation in cooling procedure, so as to cause residual stress, when residual compressive stress exceedes
During flexing critical condition, bending deformation will be produced.Therefore, the performance both needed for high-strength steel for cooling procedure plate shape
Parameter and rolling specs carry out cooldown rate control, it is also desirable to while carry out the control of cooling uniformity.
The current research and trial to two sections of refrigerating modes of laminar flow cooling technology, but primarily directed to control system
Research, or to it is different cooling routes under phase transformation process researchs.Propose in the prior art using two sections of refrigerating modes
To realize the control requirement to target high-strength steel specific performance, but research contents is temperature foh in two sections of cooling Controlling models
Mathematical method, model cootrol precision and feedback self-learning capability etc.；At present in the actual production of high-strength steel, due to cold
The factors such as high cooling velocity and inhomogeneous cooling during but, high-strength steel have the presence of higher internal residual stress, caused
There is the generation of the problems such as middle wave or side wave after finished product uncoiling, have impact on use of the high-strength steel as special steel material.When waviness is asked
Topic easily causes strip shape quality objection, caused damage to enterprise when reaching to a certain degree, and therefore, there is an urgent need for a kind of new
Technical scheme solves above-mentioned technical problem.
The content of the invention
The present invention is exactly for technical problem present in prior art, there is provided a kind of hot-rolling high-strength steel stress minimizing
Two sections of sparse section cooling methods, this method can eliminate using wave in caused high-strength steel after traditional one-step cooling method with
And the bad plate shape such as side wave, i.e., because the finish rolling high-strength steel caused by the type of cooling is unreasonable is in the roller repairing stage occurs
Portion or edge shape wave, so as to significantly improve strip shape of hot-rolled high-strength steel, the quality of hot rolled plate high strength steel plate is improved, meets every profession and trade
Demand.
To achieve these goals, the technical solution adopted by the present invention is as follows, a kind of hot-rolling high-strength steel stress minimizing
Two sections of sparse section cooling methods, it is characterised in that methods described step is as follows,
（1）Determine the intensity and product thickness of steel grade；
（2）Determine the mode of two sections of sparse coolings；
（3）The sparse cooling system of first paragraph sets and opened；
（4）The setting and unlatching of the sparse cooling of second segment.
As a modification of the present invention, the step（1）Concrete operations are as follows：Two sections of sparse cooling means are to surrender
The high-strength steel that intensity is 600MPa is object, and the rolling thickness scope being applicable is 3mm to 10mm.
As a modification of the present invention, when meeting condition 0.85≤target material conductivity t1/ design reference object passes
Conductance t0≤ 1.15, and 0.85≤target material specific heat capacity c1/ design reference object specific heat capacity c0When≤1.25, can directly it apply
Two sections of sparse cooling means.If 0.85≤t can not be met simultaneously1/t0≤ 1.15 and 0.85≤c1/c0≤ 1.25, can be according to mesh
The practical physical characteristics of material are marked, cooled region and cool time are adjusted.Due to needing first paragraph cooling and second segment
Cool down comprehensive function to hot-rolling high-strength steel, thus by first paragraph cooled region be arranged to the rolling thickness of hot-rolling high-strength steel and
Gait of march is unrelated, and second segment cooling required accepts the cooling effect of first paragraph cooling, and considers rolling thickness, gait of march
And the factor such as final cooling requirement.
As a modification of the present invention, the step（3）The sparse cooling system of first paragraph sets and opened, concrete operations
It is as follows：Laminar cooling system includes cooling and divides into 4 sections, totally 15 groups, and wherein first paragraph and the 3rd section is intensive cooling zone, cold
But cooling manifold respectively has 16 shower nozzles and 16 pneumatic operated valves up and down in region, and the upper each pneumatic operated valve of cooling manifold controls a spray
Head, the flow of each shower nozzle is 104m3/ h, lower cooling manifold is by two pneumatic operated valve co- controllings, two shower nozzles, when opening wherein
During one pneumatic operated valve, the flow of two shower nozzles is all 52 m3/ h, now the cooling capacity of the cooling zone be equal to common cooling zone；
When two pneumatic operated valves are opened simultaneously, the flow of two shower nozzles is all 62 m3/ h, now the cooling capacity of the cooling zone is more than general
Logical cooling zone and accurate adjustment cooling zone, second segment are common cooling zone, and going up cooling manifold in cooled region includes 8 shower nozzles and 8
Pneumatic operated valve, lower cooling manifold include 16 shower nozzles and 8 pneumatic operated valves, and when the cooling zone is come into operation, upper cooling manifold is single
The flow of shower nozzle is equal to the flow of single pneumatic operated valve, is 104 m3/h；The lower single pneumatic operated valve of cooling manifold controls two shower nozzles, single
Individual pneumatic operated valve flow is 104 m3/ h, single capacity of sprinkler are 52 m3/ h, the 4th section is accurate adjustment cooling zone, in cooled region up and down
Cooling manifold respectively has 16 shower nozzles and 16 pneumatic operated valves, and a pneumatic operated valve controls a shower nozzle, the i.e. flow of pneumatic operated valve and shower nozzle
It is all 52 m3/h；The relatively fine regulation and control to amount of cooling water can be achieved.Due to the 1st group and the 2nd group of cooling zone cooling water capacity
The frame multifunction instrument detection zone of finish rolling the 7th easily is flowed to, influences multifunction instrument accuracy of detection, therefore close the 1st group and the 2nd
Group cooled region, the sparse cooling of first paragraph is completed by the 3rd group of cooling zone, because cooling manifold is relatively fixed, is easy to improve model
Setting accuracy, cooling device controls 16 groups of shower nozzles by 16 pneumatic operated valves up and down for the cooling zone, and upper cooling device one is pneumatic
Valve controls one group of shower nozzle, and lower cooling device controls two groups of shower nozzles simultaneously by two pneumatic operated valves, when 1 valve is opened, two groups of shower nozzles
Flow be 104m3/ h, when 2 pneumatic operated valves are opened simultaneously, the flow of 2 groups of shower nozzles can reach 124m3/ h, the layer
Pressure is about 0.00833MPa in flow cooling system upper header, and next part overpressure is about 0.0049-0.0098MPa；First
In the sparse cooling of section, the factors such as rolling thickness and gait of march are not considered, before hot-rolling high-strength steel reaches section cooling region,
Open odd number row's pneumatic operated valve of the 3rd group of cooled region, odd number group shower nozzle opening, lower cooling device are complete in cooling device in realizations
Portion's shower nozzle is opened, and the flow of single group shower nozzle is 104m3/h。
As a modification of the present invention, the step（4）The sparse cooling system of second segment sets and opened, concrete operations
It is as follows,
The the 9th to the 13rd group of cooling zone configuration is identical with the 3rd group of cooling zone used in the sparse cooling of second segment, the 14th group and the 15th
Cooling device controls 16 groups of shower nozzles by 16 pneumatic operated valves up and down for group cooling zone, opens whole shower nozzles and whole pneumatic operated valves, real
The flow of existing single group shower nozzle is 52m3/h.With 52m3/ h cooling flow is a coolant flat, is cooled down in the sparse cooling of second segment single
Digit is N1, i.e. the flow of the one group of shower nozzle in the 14th and the 15th group of cooling zone is a coolant flat, the 9th to the 13rd group of cooling zone one
The flow of group shower nozzle is two coolant flats；Second segment is sparse to be cooled down by the 14th group of cooling zone and is by the 14th group of cooling zone
The cooling zone that initial point extends forwards, backwards is completed jointly, and gait of march is v when hot-rolling high-strength steel reaches second segment sparse cooled region0
（m/s）, rolling thickness h（mm）, then determine that second segment is sparse cold according to the gait of march of hot-rolling high-strength steel and rolling thickness
But the calculation formula of coolant flat number is：
N1=14.5* v0+14.5*h-145 v0>0 m/s, 3mm≤h≤10mm；
Work as N1When calculated value reaches the coolant flat number after extending cooled region in next step from upper coolant flat number, perform
Extension cooled region increases the order of the cooling spray number of unlatching forward or backward, considers the rolling thickness h and row of high-strength steel
It is negative correlativing relation to enter speed v, it is ensured that coolant flat number N1For on the occasion of.
As a modification of the present invention, the step（4）During the sparse cooling system of first paragraph sets and opened, when the
14 groups of cooled regions all come into operation, but when being unsatisfactory for cooling flow demand, by opening coolant flat number forward and backward
2:1 ratio carries out the extension of cooled region, i.e., when extending forward, upper cooling device opens one every one group of shower nozzle being closed
Group shower nozzle, realize and open and close staggeredly extension, the average discharge for reaching two groups of shower nozzles is 52m3/ h cooling effect, lower cooling
The shower nozzle of device is fully open, opens odd number row's pneumatic operated valve, it is 104m to make lower cooling device single group capacity of sprinkler3/ h, expands forward
Open up on one group after cooling spray, when extending cooled region again, extend cooling spray on one group backward, front and rear alternating expansion, two
Person's coolant flat number ratio is 2:1；The shower nozzle of cooling device is fully open under extended area, and cooling device cools down under front and rear region
Units ratio is 2:1.
It is as follows the advantages of this technology relative to prior art：The design that present invention passes through two sections of sparse cooling means
It can eliminate using the bad plate shape such as wave and side wave in high-strength steel caused by traditional one-step cooling method, and without to existing
There is equipment to be improved.By related art scheme of the present invention in the implementation of certain hot rolling line of hot rolling mill 1780, realize pair
Effective control of high-strength steel shape wave problem, the quality of high-strength steel being improved, high-strength steel plate shape correlated quality objection amount is decreased obviously,
Two sections of sparse cooling means can eliminate the shape wave problem using high-strength steel caused by traditional one-step cooling method, carry significantly
The high quality of high strength steel plate.
Brief description of the drawings
Fig. 1 high-strength steel cooling facility for laminar flow layout drawings.
The general frame of Fig. 2 hot-rolling high-strength steels two sections of sparse cooling means of laminar cooling process.
The application note figure of two sections of sparse cooling means of Fig. 3 laminar cooling process in systems.
Embodiment
In order to deepen the understanding of the present invention and understanding, the present invention is made with reference to the accompanying drawings and detailed description into one
Step description and introduction.
Embodiment 1：Referring to Fig. 1-Fig. 3, a kind of two sections of sparse section cooling methods of hot-rolling high-strength steel stress minimizing,
Methods described step is as follows,
（1）Determine the intensity and product thickness of steel grade；The height of two sections of sparse cooling means using yield strength as 600MPa
Strong steel is object, and the rolling thickness scope being applicable is 3mm to 10mm；
（2）Determine the mode of two sections of sparse coolings；When meeting condition 0.85≤target material conductivity t1/ design reference pair
As conductivity t0≤ 1.15, and 0.85≤target material specific heat capacity c1/ design reference object specific heat capacity c0, can be direct when≤1.25
Using two sections of sparse cooling means.If 0.85≤t can not be met simultaneously1/t0≤ 1.15 and 0.85≤c1/c0≤ 1.25, can root
According to the practical physical characteristics of target material, cooled region and cool time are adjusted.Due to needing first paragraph cooling and the
Comprehensive function of the two-step cooling to hot-rolling high-strength steel, therefore it is thick that first paragraph cooled region is arranged into rolling with hot-rolling high-strength steel
Degree and gait of march are unrelated, and second segment cooling required accepts the cooling effect of first paragraph cooling, and consider rolling thickness, advance
The factor such as speed and final cooling requirement；
Using the laminar flow cooling technology of the sparse cooling of two-part, not only high-strength steel Ovshinsky can be suppressed by first paragraph water cooling
Body grain growth, high-strength steel final strength and plastic property are improved, made simultaneously also by first paragraph and the comprehensive of second segment water cooling
With reaching the chilling temperature requirement of high-strength steel, and it ensure that temperature of the high-strength steel in cooling procedure on width and thickness direction
The synchronism of uniformity and phase transformation process, reaches the purpose for reducing high-strength steel built-in thermal stress and structural stress, this two sections
Sparse cooling means technological process is as shown in Fig. 2 comprise the following steps that：
（3）The sparse cooling system of first paragraph sets and opened；Cooling facility for laminar flow be located at mm finishing mill unit after, underground batches
Before unit, directly over heat output roller way, as shown in figure 1, cooling facility for laminar flow can according to belt steel thickness, temperature, steel grade and
The technological parameters such as mill speed, control water spray group number, regulating pondage, temperature is batched required by strip is cooled to by finishing temperature
Degree.
The laminar cooling system includes cooling and divides into 4 sections, totally 15 groups, as shown in table 1, wherein first paragraph and the 3rd section
For intensive cooling zone, cooling manifold respectively has 16 shower nozzles and 16 pneumatic operated valves up and down in cooled region.The upper each gas of cooling manifold
Dynamic valve controls a shower nozzle, and the flow of each shower nozzle is 104m3/h.Lower cooling manifold is by two pneumatic operated valve co- controllings, two sprays
Head, when opening one of pneumatic operated valve, the flow of two shower nozzles is all 52 m3/ h, now cooling capacity of the cooling zone etc.
In common cooling zone；When two pneumatic operated valves are opened simultaneously, the flow of two shower nozzles is all 62 m3/ h, the now cooling zone
Cooling capacity is more than common cooling zone and accurate adjustment cooling zone.Second segment is common cooling zone, and cooling manifold bag is gone up in cooled region
Containing 8 shower nozzles and 8 pneumatic operated valves, lower cooling manifold includes 16 shower nozzles and 8 pneumatic operated valves.When the cooling zone is come into operation,
The flow of the upper single shower nozzle of cooling manifold is equal to the flow of single pneumatic operated valve, is 104 m3/h；The lower single pneumatic operated valve of cooling manifold
Two shower nozzles are controlled, single pneumatic operated valve flow is 104 m3/ h, single capacity of sprinkler are 52 m3/h.4th section is that accurate adjustment cools down
Area, cooling manifold respectively has 16 shower nozzles and 16 pneumatic operated valves up and down in cooled region.One pneumatic operated valve controls a shower nozzle, i.e. gas
The flow of dynamic valve and shower nozzle is all 52 m3/ h, the relatively fine regulation and control to amount of cooling water can be achieved.
Because the 1st group and the 2nd group of cooling zone cooling water readily flow to the frame multifunction instrument detection zone of finish rolling the 7th, shadow
Multifunction instrument accuracy of detection is rung, therefore closes the 1st group and the 2nd group of cooled region.The sparse cooling of first paragraph is by the 3rd group of cooling zone
Complete, can so improve model specification precision, and there is versatility.Cooling device is by 16 pneumatic operated valve controls above and below the cooling zone
16 groups of shower nozzles are made, upper one pneumatic operated valve of cooling device controls one group of shower nozzle, and lower cooling device controls two simultaneously by two pneumatic operated valves
Group shower nozzle, so when 1 valve is opened, the flow of two groups of shower nozzles is 104m3/ h, when 2 pneumatic operated valves are opened simultaneously,
The flow of 2 groups of shower nozzles can reach 124m3/h.Pressure is about 0.00833MPa in the laminar cooling system upper header, lower collector pipe
Interior pressure is about 0.0049-0.0098MPa.
In the sparse cooling of first paragraph, the factors such as rolling thickness and gait of march are not considered, and layer is reached in hot-rolling high-strength steel
Before flowing cooled region, odd number row's pneumatic operated valve of the 3rd group of cooled region is opened, odd number group shower nozzle is beaten in cooling device in realization
Open, lower cooling device whole shower nozzle is opened, and the flow of single group shower nozzle is 104m3/h。
（4）The setting and unlatching of the sparse cooling of second segment；The sparse cooling required of second segment considers the rolling of hot-rolling high-strength steel
Thickness and gait of march, the sparse cooling system arrangement of second segment and open method are as described below；
The rolling thickness scope that this method is applicable is 3mm to 10mm, for Thin Specs（3mm or so）Hot-rolling high-strength steel,
Need to consider cooling rate control and section cooling stage temperature drop scope control in the section cooling stage, for think gauge（10mm is left
It is right）Hot-rolling high-strength steel, need to consider cooling rate control and including thickness direction and width in the section cooling stage
Cooling uniformity controls；Because gait of march of the hot-rolling high-strength steel after rolling on rollgang is related to rolling thickness, therefore should
Cooling means considers rolling thickness and gait of march simultaneously, and type of cooling selection is carried out for different-thickness hot-rolling high-strength steel.
The the 9th to the 13rd group of cooling zone configuration is identical with the 3rd group of cooling zone used in the sparse cooling of second segment.14th group and
Cooling device controls 16 groups of shower nozzles by 16 pneumatic operated valves up and down for 15 groups of cooling zones, opens whole shower nozzles and whole pneumatic operated valves,
The flow for realizing single group shower nozzle is 52m3/h.With 52m3/ h cooling flow is a coolant flat, is cooled down in the sparse cooling of second segment
Units is N1, i.e. the flow of the one group of shower nozzle in the 14th and the 15th group of cooling zone is a coolant flat, the 9th to the 13rd group of cooling zone
The flow of one group of shower nozzle is two coolant flats.
The sparse cooling of second segment extends cold forwards, backwards by the 14th group of cooling zone and by the 14th group of cooling zone for starting point
But area completes jointly.Gait of march is v when hot-rolling high-strength steel reaches second segment sparse cooled region0（m/s）, rolling thickness h
（mm）.
The coolant flat number of the sparse cooling of second segment is then determined according to the gait of march of hot-rolling high-strength steel and rolling thickness
Calculation formula be：
N1=14.5* v0+14.5*h-145 v0>0 m/s, 3mm≤h≤10mm
Work as N1When calculated value reaches the coolant flat number after extending cooled region in next step from upper coolant flat number, perform
Extension cooled region increases the order of the cooling spray number of unlatching forward or backward.Consider the rolling thickness h and row of high-strength steel
It is negative correlativing relation to enter speed v, it is ensured that coolant flat number N1For on the occasion of.
When the 14th group of cooled region all comes into operation, but is unsatisfactory for cooling flow demand, by opening forward and backward
Open coolant flat number 2:1 ratio carries out the extension of cooled region.When extending forward, upper cooling device is closed every one group
Shower nozzle open one group of shower nozzle, realize open and close staggeredly extend, the average discharge for reaching two groups of shower nozzles is 52m3/ h's is cold
But effect.The shower nozzle of lower cooling device is fully open, opens odd number row's pneumatic operated valve, makes the lower cooling device single group capacity of sprinkler be
104m3/h.Extend forward on one group after cooling spray, when extending cooled region again, extend cooling spray on one group backward, it is preceding
Alternating expansion afterwards, the two coolant flat number ratio are 2:1.The shower nozzle of cooling device is fully open under extended area, front and rear region
Lower cooling device coolant flat number ratio is 2:1.
When the rolling thickness of this kind of high-strength steel is 3mm, speed when it reaches second segment sparse cooled region is
8.43m/s, now N1Calculated value be 20.74, not up to forwards, backwards respectively extension one group of shower nozzle after continue to extend one group of spray forward
The coolant flat number 21 that head is reached, therefore round backward as 19.Now the 14th group of cooled region can not meet the cold of high-strength steel
But amount requires, respectively extends one group of cooling spray, the coolant flat number N of the sparse cooling of second segment forwards, backwards1And each cooled region
Actual unlatching situation of cooling spray etc. is as shown in table 2.
" bank3 opens situation " is the actual unlatching situation of the sparse cooled region cooling spray of first paragraph in table 2." | " exists
Represent the position shower nozzle in table 2 to open, " o " represents the position shower nozzle in table 2 and closed." bank12 open situation " extremely
" bank15 opens situation " is the actual unlatching situation of the sparse cooled region cooling spray of second segment.The sparse cooled region of second segment
Shower nozzle opens situation and depends on coolant flat number N1Actual value, i.e., the unlatching situation of this section cooled region cooling spray and heat
Rolling thickness and the gait of march for rolling high-strength steel are relevant.
In the embodiment, first, the applicability of two sections of sparse cooling means is judged, when the condition that meets 0.85≤
Target material conductivity t1/ design reference object conductivity t0≤ 1.15, and 0.85≤target material specific heat capacity c1/ design reference
Object specific heat capacity c0When≤1.25, two sections of sparse cooling means can be directly applied.If 0.85≤t can not be met simultaneously1/t0≤
1.15 and 0.85≤c1/c0≤ 1.25, cooled region and cool time can be carried out according to the practical physical characteristics of target material
Adjustment.
Then, in step 1, first paragraph cooled region setting is carried out.Since away from finish rolling export about 20m far from
The sparse cooling of first paragraph is carried out, is evenly arranged 8 groups of cooling sprays in the cooled region of 7m length, and the flow of single group shower nozzle is
104m3/h。
Then, in step 2, the setting of second segment cooled region is carried out.With away from finish rolling exit about 110m it is remote roll after
It is the cooled region center of the sparse cooling initial time of second segment at rollgang, calculates required coolant flat number N1
, N1=14.5* high-strength steel gait of march v0+ 14.5* high-strength steel rolling thickness h-145, according to the N being calculated1Value, carry out
The arrangement of cooled region.When each 8 groups of cooling sprays can provide enough amount of cooling water before and after cooling center, often open one group it is cold
But the cooling spray before center, while open the cooling spray behind one group of cooling center.When 16 groups of cooling sprays provided it is cold
When but measuring insufficient, by opening coolant flat number 2 forward and backward:1 ratio carries out the extension of cooled region.It is single in required cooling
Digit is changed, i.e., variable speed rolling when, cooled region before and after cooling center also to correspondingly being extended.This two sections sparse cold
But the flatness hit rate contrast of high-strength steel is as shown in table 3 before and after method is implemented.
It can eliminate or improve using caused by traditional one-step cooling method by the design of two sections of sparse cooling means
The bad plate shape such as wave and side wave in high-strength steel, and without being improved to existing equipment, realize and high-strength steel shape wave is asked
Effective control of topic, the quality of high-strength steel is improved, high-strength steel plate shape correlated quality objection amount is decreased obviously, and shows such a two sections
Sparse cooling means can eliminate or significantly improve the shape wave problem using high-strength steel caused by traditional one-step cooling method.Should
The flatness hit rate of high-strength steel can be seen that the technical scheme to such as table 3 and realize before and after two sections of sparse cooling means are implemented
Effective control to high-strength steel sheet shape wave problem, substantially increase the quality of steel plate.
It should be noted that above-described embodiment, is not used for limiting protection scope of the present invention, in above-mentioned technical proposal
On the basis of made equivalents or replacement each fall within the scope that the claims in the present invention are protected.
Claims (3)
1. a kind of two sections of sparse section cooling methods of hot-rolling high-strength steel stress minimizing, it is characterised in that methods described step
It is as follows,（1）Determine the intensity and product thickness of steel grade；（2）Determine the mode of two sections of sparse coolings；（3）First paragraph is sparse cold
But system sets and opened；（4）The setting and unlatching of the sparse cooling of second segment；
The step（1）Concrete operations are as follows：The high-strength steel of two sections of sparse cooling means using yield strength as 600MPa is pair
As the rolling thickness scope being applicable is 3mm to 10mm；
The step（2）Concrete operations are as follows：When meeting condition 0.85≤target material conductivity t1/ design reference object conducts
Rate t0≤ 1.15, and 0.85≤target material specific heat capacity c1/ design reference object specific heat capacity c0When≤1.25, can directly apply should
Two sections of sparse cooling means；If 0.85≤t can not be met simultaneously1/t0≤ 1.15 and 0.85≤c1/c0≤ 1.25, can be according to mesh
The practical physical characteristics of material are marked, cooled region and cool time are adjusted；
The step（3）The sparse cooling system of first paragraph sets and opened, and concrete operations are as follows：Laminar cooling system includes cold
But 4 sections are divided into, totally 15 groups, wherein first paragraph and the 3rd section is intensive cooling zone, and cooling manifold respectively has up and down in cooled region
16 shower nozzles and 16 pneumatic operated valves, the upper each pneumatic operated valve of cooling manifold control a shower nozzle, and the flow of each shower nozzle is 104m3/
H, lower cooling manifold is by two pneumatic operated valve co- controllings, two shower nozzles, when opening one of pneumatic operated valve, the stream of two shower nozzles
Amount is all 52m3/ h, now the cooling capacity of the cooling zone be equal to common cooling zone；When two pneumatic operated valves are opened simultaneously, two
The flow of shower nozzle is all 62m3/ h, now the cooling capacity of the cooling zone be more than common cooling zone and accurate adjustment cooling zone, second segment
For common cooling zone, upper cooling manifold include 8 shower nozzles and 8 pneumatic operated valves in cooled region, and lower cooling manifold includes 16 and sprayed
Head and 8 pneumatic operated valves, when the cooling zone is come into operation, the flow of the upper single shower nozzle of cooling manifold is equal to the stream of single pneumatic operated valve
Amount, is 104m3/h；The lower single pneumatic operated valve of cooling manifold controls two shower nozzles, and single pneumatic operated valve flow is 104m3/ h, single shower nozzle
Flow is 52m3/ h, the 4th section is accurate adjustment cooling zone, in cooled region up and down cooling manifold respectively have 16 shower nozzles and 16 it is pneumatic
Valve, a pneumatic operated valve control a shower nozzle, i.e. the flow of pneumatic operated valve and shower nozzle is all 52m3/h；Close the 1st group and the 2nd group of cooling
Region, the sparse cooling of first paragraph is completed by the 3rd group of cooling zone, because cooling manifold is relatively fixed, is easy to improve the setting of model
Precision, cooling device controls 16 groups of shower nozzles, upper one pneumatic operated valve control of cooling device by 16 pneumatic operated valves up and down for the cooling zone
One group of shower nozzle, lower cooling device control two groups of shower nozzles simultaneously by two pneumatic operated valves, when 1 valve is opened, the flow of two groups of shower nozzles
It is 104m3/ h, when 2 pneumatic operated valves are opened simultaneously, the flow of 2 groups of shower nozzles can reach 124m3/ h, the section cooling
Pressure is about 0.00833MPa in system upper header, and next part overpressure is about 0.0049-0.0098MPa；It is sparse in first paragraph
In cooling, the factors such as rolling thickness and gait of march are not considered, before hot-rolling high-strength steel reaches section cooling region, open the
Odd number row's pneumatic operated valve of three groups of cooled regions, odd number group shower nozzle opening, lower cooling device whole shower nozzle in cooling device in realizations
Open, the flow of single group shower nozzle is 104m3/h。
2. a kind of two sections of sparse section cooling methods of hot-rolling high-strength steel stress minimizing according to claim 1, it is special
Sign is, the step（4）The sparse cooling system of second segment sets and opened, and concrete operations are as follows, the sparse cooling institute of second segment
Configured with the 9th to the 13rd group of cooling zone it is identical with the 3rd group of cooling zone, the 14th group and the upper and lower cooling device in the 15th group of cooling zone by
16 pneumatic operated valves control 16 groups of shower nozzles, open whole shower nozzles and whole pneumatic operated valves, the flow for realizing single group shower nozzle is 52m3/h；
With 52m3/ h cooling flow is a coolant flat, and coolant flat number is N in the sparse cooling of second segment1, i.e., the 14th and the 15th group cold
But the flow of the one group of shower nozzle in area is a coolant flat, and the flow of the 9th to the 13rd group of one group of shower nozzle in cooling zone is single for two coolings
Position；The sparse cooling of second segment is the cooling zone that starting point extends forwards, backwards by the 14th group of cooling zone and by the 14th group of cooling zone
Common to complete, gait of march is v when hot-rolling high-strength steel reaches second segment sparse cooled region0（m/s）, rolling thickness h（mm）,
Then determine that the calculating of the coolant flat number of the sparse cooling of second segment is public according to the gait of march of hot-rolling high-strength steel and rolling thickness
Formula is：N1=14.5*v0+14.5*h-145v0>0m/s, 3mm≤h≤10mm；Work as N1Calculated value reaches from upper coolant flat number
When extending the coolant flat number after cooled region in next step, perform extension cooled region increases the cooling of unlatching forward or backward
The order of shower nozzle number, the rolling thickness h and gait of march v for considering high-strength steel are negative correlativing relation, it is ensured that coolant flat number
N1For on the occasion of.
3. a kind of two sections of sparse section cooling methods of hot-rolling high-strength steel stress minimizing according to claim 2, it is special
Sign is, the step（4）The sparse cooling system of first paragraph sets and opened, when the 14th group of cooled region all comes into operation,
But when being unsatisfactory for cooling flow demand, by opening coolant flat number 2 forward and backward:1 ratio carries out the expansion of cooled region
Exhibition, i.e., when extending forward, upper cooling device opens one group of shower nozzle every one group of shower nozzle being closed, and realizes that open and close interlock
Extension, the average discharge for reaching two groups of shower nozzles is 52m3/ h cooling effect, the shower nozzle of lower cooling device is fully open, opens single
Number row's pneumatic operated valve, it is 104m to make lower cooling device single group capacity of sprinkler3/ h, extend forward on one group after cooling spray, expand again
When opening up cooled region, cooling spray on one group, front and rear alternating expansion are extended backward, and the two coolant flat number ratio is 2:1；Extension
The shower nozzle of cooling device is fully open under region, and cooling device coolant flat number ratio is 2 under front and rear region:1.
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